6 Parameter Settings and Functions
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Integral control is not conducted if the integral time is set to 0.
Setting the integral time too short can intensify correction movements and cause hunting.
6.3.3.3 Derivative time settings [PAR2 → H-D/C-D]
In accordance with the deviation of the ramp, the time taken for the MV gained from derivative
operation to reach the MV gained from proportional control is called the derivative time.
H-D Heating derivative time
C-D
Cooling derivative time
Parameter Setting range
Unit
PAR2
H-D
0000 to 9999 0000 Sec
C-D
Derivative control is not conducted if the derivative time is set to 0.
6.3.3.4 Control period settings [PAR3 → H-T/C-T]
If relay or SSR is used to output MV under proportional control, the output is on for a fixed
amount of time (within the control period, as a percentage of the MV) and then remains off for
the rest of the time. The preset period when output ON/OFF takes place is called the
proportional control period.
Control with SSR drive output has a faster response than that of relay output. Therefore, by
configuring a shorter control period, more responsive temperature control is achieved.
H-T Heating control period
C-T
Cooling control period
Parameter Setting range Factory default Unit
PAR3
H-T
output(ON/OFF control,
phase control, cycle
control): 00)1 to12)0
Current output, SSR
drive output: 00)1
Relay output: 02)0
SSR drive output: 00@0
Sec
C-T
If using heating & cooling control, configure each control period separately for heating & cooling.
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